Such a coin does not exist.
The English have never produced a 4 Pound coin.
The value of the pound today July 24, 2014 against the dollar is $1.70. This refers to the British pound in comparison to the US dollar.
A Sovereign has a face value of One Pound (GBP). In today's currency, a quarter of a Sovereign would be 25 Pence.
A British Pound in 1935 has the purchasing power of about £58 GBP today.
The exact value of a 1930 English pound is actually dependent upon a number of factors. Most importantly the condition.
A British Pound in 1999 has the purchasing power of about £1.16 GBP today.
As of today (01APR2011), 1 British Pound Sterling is worth about $1.61 US Dollars.
£5 I'm afraid.
The face value of a Scottish banknote is exactly the same as the face value of the same denomination of English banknote.
The Apaxmai, pronounced Drachmai in Greek, was the currency used in that country before they adopted the Euro in 2002. If Greece was still using it today, the value of 200 apaxmai against the English pound would be around £0.563 or half a pound if rounded off.
A British Pound in 1799 had the purchasing power of about £62.87 GBP today.
In 1750, it was worth 148.490% of what it is worth in 2005. (See link below). 150% of 1 is 1.5 so 1 pound would be worth 1.5 pounds.
One Pound GBP in 1972 had the purchasing power of about £8.80 GBP today.